Flashing Lights in Vision: Causes and Concerns

Q: Flashing Lights in Vision: Causes and Concerns

Hello： 1. <br>Flashing symptoms： When you lie in bed looking at the ceiling or wall, you may sometimes experience a sensation of flashes. <br>These flashes may be caused by some changes within the eye, such as opacities in the vitreous body or changes in vitreous traction within

Flashes of light in the visual field?

Hello, Doctor Gao: I have myopia of 200-300 degrees.
Recently, for the past two days, when I wake up and lie down looking at the ceiling or wall, I sometimes see flashes of light, similar to the flickering of a broken light bulb.
If I change my gaze or position, the flashes stop, but if I maintain the same position and line of sight, the flashes are likely to occur again.
However, outside of just waking up while lying down, I haven't experienced any flashes at other times.
I would like to ask if this is a normal situation and whether it could be related to eye strain, as my field of study requires long hours of computer use.
Additionally, I have noticed that since childhood, my vision has appeared grainy like a television with static, especially in dark areas, and sometimes I see moving purple phantoms in the dark.
I used to think everyone saw this way, but I recently realized that might not be the case.
Could this also be related to the flashes I see? Is it possible for this grainy vision to disappear?

Yuna, 20~29 year old female. Ask Date: 2023/10/17

Dr. Gao Pilin reply Ophthalmology

Hello: 1.
Flashing symptoms: When you lie in bed looking at the ceiling or wall, you may sometimes experience a sensation of flashes.
These flashes may be caused by some changes within the eye, such as opacities in the vitreous body or changes in vitreous traction within the eye.
This is not necessarily related to myopia, but further evaluation is needed.
2.
Visual noise: You mentioned that your visual field has some noise, especially in dark areas, and that you see moving purple phantoms in the dark.
This could be due to issues with the retina or other ocular structures, but more examinations are required to determine the cause.

Reply Date: 2023/10/17

More Info

Flashing lights in vision can be concerning, especially when they occur unexpectedly or in specific situations, such as when lying down and looking at a ceiling or wall. Your experience of seeing flashes that resemble a flickering light bulb could be attributed to several factors, particularly given your history of myopia (nearsightedness) and prolonged computer use.

Firstly, the flashes you describe may be related to changes in the vitreous gel inside your eye. As we age or due to certain conditions, the vitreous can become less gel-like and more liquid, leading to the formation of floaters or flashes of light. This phenomenon is often benign, especially if it occurs infrequently and is not accompanied by other symptoms such as a sudden increase in floaters, a shadow in your peripheral vision, or a significant decrease in vision. However, since you have a history of myopia, which is associated with a higher risk of retinal issues, it is essential to monitor these symptoms closely.

Regarding your concern about whether these flashes could be related to excessive eye strain from prolonged computer use, it is indeed possible. Extended periods of screen time can lead to digital eye strain, which may cause various visual disturbances, including temporary flashes or afterimages. Taking regular breaks using the 20-20-20 rule—looking at something 20 feet away for 20 seconds every 20 minutes—can help alleviate some of this strain.

As for the visual noise you mentioned, particularly in low-light conditions, this could be a separate issue. Visual noise, or the perception of static-like patterns in your vision, can sometimes be linked to the way your brain processes visual information. The purple moving shadows you see in the dark may be a type of visual phenomenon known as "entoptic phenomena," where you perceive light or shapes that originate from within your own eye or visual system. This is not uncommon and can vary from person to person.

If these visual disturbances have been present since childhood, it may indicate a unique way your visual system functions, but it is essential to differentiate between benign phenomena and potential underlying issues. Regular eye examinations are crucial, especially given your history of myopia and the recent changes in your vision. An eye care professional can conduct a thorough examination to rule out any serious conditions, such as retinal detachment or other retinal disorders.

In summary, while the flashes and visual noise you are experiencing may not be immediately alarming, they warrant attention, particularly given your myopia and the potential for retinal complications. It is advisable to schedule an appointment with an eye care specialist for a comprehensive evaluation. They can provide personalized insights and recommendations based on your specific symptoms and visual history. Regular monitoring and proactive eye care are key to maintaining your eye health, especially in the context of your visual experiences.

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